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2009 Nov 13
2
linear model and by()
Hello R list,
This is a question for anyone who has used the by() command. I would like to
perform a regression on a data frame by several factors. Using by() I think
that I have able to perform this using the following:
> lm.r <- by(master, list(Sectionf=Sectionf, startd=startd), function(x) lm
(tot.c ~ starttime, data = x))
So that is, I would like to perform separate regressions for each level of
Sectionf for each level of startd. Now I can get the coefficients and
intercepts from all the fitted models. However, I am now unsure how to glean
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